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- W315094131 abstract "From an analysis of the ${ensuremath{pi}}^{ensuremath{-}}$ backward differential cross-section data, which clearly shows a cusplike structure near the $ensuremath{eta}n$ threshold, we deduce, using partial-wave unitarity relations, the size and the orientation of the cusp. The cusp appears because of the strong coupling of the $ensuremath{eta}n$ channel to an ${N}^{ensuremath{'}}$ resonance just above its threshold. Using the above information on the cusp, the $ensuremath{pi}N {S}_{11}$ partial-wave amplitude is fitted through the $ensuremath{eta}n$ threshold and the resonance. The effect of the size of the cusp, acting as a constraint, on the resonance parameters determined in the fit is emphasized. The fit also determines the phase of the $ensuremath{eta}n$ production amplitude at the $ensuremath{eta}n$ threshold, which then using the knowledge of the orientation of the cusp gives information on the phase of the elastic no-spin-flip amplitude at the $ensuremath{eta}n$ threshold. This information could be a useful constraint in $ensuremath{pi}N$ partial-wave analysis." @default.
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- W315094131 date "1977-01-01" @default.
- W315094131 modified "2023-10-16" @default.
- W315094131 title "πN S11partial-wave amplitude near theηnproduction threshold" @default.
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- W315094131 doi "https://doi.org/10.1103/physrevd.15.192" @default.
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